Android: implement QMediaPlayer::setPlaybackRate()

Only possible on Android API level 23 or higher.

Task-number: QTBUG-61115
Change-Id: I147575ed0a48f84d4208978a67e0856918e65b3d
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

2 files changed, 42 insertions, 3 deletions

diff --git a/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.cpp b/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.cpp
index 7aa7b97b8..df1463a87 100644
--- a/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.cpp
+++ b/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.cpp
@@ -93,7 +93,9 @@ QAndroidMediaPlayerControl::QAndroidMediaPlayerControl(QObject *parent)
       mPendingVolume(-1),
       mPendingMute(-1),
       mReloadingMedia(false),
-      mActiveStateChangeNotifiers(0)
+      mActiveStateChangeNotifiers(0),
+      mPendingPlaybackRate(1.0),
+      mHasPendingPlaybackRate(false)
 {
     connect(mMediaPlayer,SIGNAL(bufferingChanged(qint32)),
             this,SLOT(onBufferingChanged(qint32)));
@@ -290,12 +292,45 @@ void QAndroidMediaPlayerControl::updateAvailablePlaybackRanges()
 
 qreal QAndroidMediaPlayerControl::playbackRate() const
 {
-    return 1.0f;
+    if (mHasPendingPlaybackRate ||
+            (mState & (AndroidMediaPlayer::Initialized
+                       | AndroidMediaPlayer::Prepared
+                       | AndroidMediaPlayer::Started
+                       | AndroidMediaPlayer::Paused
+                       | AndroidMediaPlayer::PlaybackCompleted
+                       | AndroidMediaPlayer::Error)) == 0) {
+        return mPendingPlaybackRate;
+    }
+
+    return mMediaPlayer->playbackRate();
 }
 
 void QAndroidMediaPlayerControl::setPlaybackRate(qreal rate)
 {
-    Q_UNUSED(rate);
+   if ((mState & (AndroidMediaPlayer::Initialized
+                   | AndroidMediaPlayer::Prepared
+                   | AndroidMediaPlayer::Started
+                   | AndroidMediaPlayer::Paused
+                   | AndroidMediaPlayer::PlaybackCompleted
+                   | AndroidMediaPlayer::Error)) == 0) {
+        if (mPendingPlaybackRate != rate) {
+            mPendingPlaybackRate = rate;
+            mHasPendingPlaybackRate = true;
+            Q_EMIT playbackRateChanged(rate);
+        }
+        return;
+    }
+
+    bool succeeded = mMediaPlayer->setPlaybackRate(rate);
+
+    if (mHasPendingPlaybackRate) {
+        mHasPendingPlaybackRate = false;
+        mPendingPlaybackRate = qreal(1.0);
+        if (!succeeded)
+             Q_EMIT playbackRateChanged(playbackRate());
+    } else if (succeeded) {
+        Q_EMIT playbackRateChanged(rate);
+    }
 }
 
 QMediaContent QAndroidMediaPlayerControl::media() const
@@ -720,6 +755,8 @@ void QAndroidMediaPlayerControl::flushPendingStates()
         setVolume(mPendingVolume);
     if (mPendingMute != -1)
         setMuted((mPendingMute == 1));
+    if (mHasPendingPlaybackRate)
+        setPlaybackRate(mPendingPlaybackRate);
 
     switch (newState) {
     case QMediaPlayer::PlayingState:
diff --git a/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.h b/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.h
index 04f728a59..119add7f8 100644
--- a/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.h
+++ b/src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.h
@@ -117,6 +117,8 @@ private:
     int mPendingMute;
     bool mReloadingMedia;
     int mActiveStateChangeNotifiers;
+    qreal mPendingPlaybackRate;
+    bool mHasPendingPlaybackRate; // we need this because the rate can theoretically be negative
 
     void setState(QMediaPlayer::State state);
     void setMediaStatus(QMediaPlayer::MediaStatus status);